Span Length

Hey

I need some help with picking the right size bearer and joists. I have made a rendered besser brick wall which is only 700mm high and 7000mm long and is 800mm from the fence. I am putting decking from the fence to the top of the wall to make a long bench seat. The decking will run parallel to the fence. I have cut just hangers into the besser block and wanted to concrete the joists into place.

Can i use H3 treated pine for the joists?
Can i use 70 x 45 H3 (has to span only 640mm)?
What size bearer can i use to run down the fence line? I was going to use either 140 x 45 H3 or 190 x 45 and how are apart should my supports be? I was going to put them at 1600mm

i have enclosed some pics

Thanks
Scott

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